# US 2014/0194845 A1 · Polymer Compositions and Nonwoven Compositions Prepared Therefrom > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194845 A1 - Document ID: US20140194845A1 - Status: Published application - Kind: A1 - Application number: 14/202,869 - Filed: 2014-03-10 - Published: 2014-07-10 - Earliest claimed: 2011-12-02 - Assignees: ExxonMobil Chemical Patents Inc. - Applicants: ExxonMobil Chemical Patents Inc. - Inventors: Galen C. Richeson; Rainer Kolb; Jean-Roch H. Schauder; Thomas T. Sun - Web page: https://patentgrep.com/patent/US20140194845A1 ## CPC - C08L 23/14: Copolymers of propene (C08L23/16 takes precedence) - A61L 15/26: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)} - C08F 210/06: Propene - C08L 23/10: Homopolymers or copolymers of propene - C08L 23/142: {at least partially crystalline copolymers of propene with other olefins} - D04H 3/007: Addition polymers - D04H 3/16: with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion - C08F 4/65908: {in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+} - C08F 4/65927: {two cyclopentadienyl rings being mutually bridged} - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst - Y10T 442/601: Nonwoven fabric has an elastic quality - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Propylene-based polymer compositions are provided comprising propylene and from about 5 wt % to about 20 wt % of one or more C2 and/or C4-C12 α-olefins. The polymer compositions have a triad tacticity greater than about 90%, a heat of fusion less than about 75 J/g, and a melt flow rate (MFR) greater than or equal to about 25 g/10 min (230° C., 2.16 kg). Further, the polymer compositions are reactor grade compositions comprising a reactor blend of a first polymer and a second polymer, preferably where both of the first and second polymers are prepared using the same catalyst system. Meltspun nonwoven fabrics, such as meltblown or spunbond fabrics, comprising such polymer compositions are also provided, as well as processes for forming the nonwoven fabrics. ## Claims ### Claim at position 1 1-6. (canceled) ### Claim 7 A nonwoven composition having at least one elastic layer, wherein the elastic layer comprises a propylene-based polymer composition, and wherein: the polymer composition comprises propylene and from about 5 wt % to about 20 wt % ethylene and/or a C4-C12 alpha-olefin; the polymer composition has a triad tacticity greater than about 90%, a heat of fusion less than about 75 J/g, and an MFR greater than or equal to about 25 g/10 min (230° C., 2.16 kg); the polymer composition is a reactor grade composition comprising a reactor blend of a first polymer and a second polymer; the first and second polymers are prepared with the same catalyst system; and the nonwoven composition has at least one of (a) a 2nd cycle permanent set less than or equal to about 9%; (b) 1st cycle retractive force at 50% recovery greater than about 1.6 N; and (c) a 2nd cycle retractive force at 50% recovery greater than about 1.5 N. ### Claim 8 (depends on 7) The nonwoven composition of claim 7, wherein the polymer composition has an MFR greater than or equal to about 29 g/10 min. ### Claim 9 (depends on 7) The nonwoven composition of claim 7, wherein the polymer composition comprises from about 5 to about 13 wt % ethylene and/or a C4-C12 alpha-olefin. ### Claim 10 (depends on 7) The nonwoven composition of claim 7, wherein the nonwoven composition has a 2nd cycle permanent set less than or equal to about 9%. ### Claim 11 (depends on 7) The nonwoven composition of claim 7, wherein the nonwoven composition has a 1st cycle retractive force at 50% recovery greater than about 1.6 N. ### Claim 12 (depends on 7) The nonwoven composition of claim 7, wherein the nonwoven composition has a 2nd cycle retractive force at 50% recovery greater than about 1.5 N. ### Claim 13 (depends on 7) The nonwoven composition of claim 7, further comprising one or more facing layers. ### Claim 14 (depends on 13) The nonwoven composition of claim 13, wherein the facing layer comprises at least one of polypropylene and polyethylene terephthalate. ### Claim 15 (depends on 13) The nonwoven composition of claim 13, wherein the elastic layer is a meltblown layer, and at least one of the facing layers is a spunbond layer. ### Claim 16 (depends on 13) The nonwoven composition of claim 13, wherein the elastic layer is a meltblown layer positioned between two spunbond facing layers, and wherein at least one of the spunbond layers comprises an impact copolymer. ### Claim 17 (depends on 7) An article comprising the nonwoven composition of claim 7. ### Claim 18 (depends on 17) The article of claim 17, wherein the article is a diaper, adult incontinence product, or other personal hygiene product. ### Claim at position 14 19-24. (canceled) ### Claim 25 (depends on 7) The nonwoven composition of claim 7, wherein the polymer composition has at least one of (a) a Die C tear strength greater than or equal to about 195 lbf/in, and (b) a force required to break apart two or more pellets formed from the polymer composition and stored under a load at 50° C. for one week of less than about 20 N, based on the storage stability test described herein. ### Claim 26 (depends on 7) The nonwoven composition of claim 7, wherein the polymer composition has a melt temperature less than or equal to about 100° C. ### Claim 27 (depends on 7) The nonwoven composition of claim 7, wherein the polymer composition has a Die C tear strength greater than or equal to about 195 lbf/in. ### Claim 28 (depends on 7) The nonwoven composition of claim 7, wherein the force required to break apart two or more pellets formed from the polymer composition and stored under a load at 50° C. for one week is less than about 20 N.